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Acadia National Park Managers’ Report
A citizen science early-detection summary
Welcome to the weekly early detection report of observations submitted by iNaturalist and eBird users. These are all observations submitted over the past week for species that Acadia National Park managers and partners have identified as being of conservation interest. These data for this report comes from two of the largest open source citizen science projects: iNaturalist and eBird. The records included in this report include both casual and research grade observations, so erroneous identifications are possible. Users should double check the identification of species to ensure they are correct.
02 October 2025 - 08 October 2025

Explore Species Locations

Invasive Species

A Hemlock tree infested with Hemlock Woolly Adelgid
© Jesse Wheeler
Scientific Name Common Name Date Observed Link
Berberis vulgaris european barberry 2025-10-04 view observation
Lupinus polyphyllus large-leaved lupine 2025-10-03 view observation
Lonicera morrowii morrow’s honeysuckle 2025-10-04 view observation
Rosa rugosa rugosa rose 2025-09-30 view observation
Rosa rugosa rugosa rose 2025-10-02 view observation

Threatened & Endangered Species

Two Red Knots in flight
© Fyn Kynd
Scientific Name Common Name Listing Date Observed Link
Falco peregrinus peregrine falcon state endangered 2025-09-29 view observation
Falco peregrinus peregrine falcon state endangered 2025-09-30 view observation
Falco peregrinus peregrine falcon state endangered 2025-09-30 view observation
Falco peregrinus peregrine falcon state endangered 2025-10-04 view observation
Asio flammeus short-eared owl state threatened 2025-10-03 view observation

Rare Species

A flowering Nodding Trillium
© Andy Fyon
Scientific Name Common Name Date Observed Link
Polypodium appalachianum appalachian rockcap fern 2025-09-30 view observation
Solidago flexicaulis broad-leaved goldenrod 2025-10-04 view observation
Solidago flexicaulis broad-leaved goldenrod 2025-10-05 view observation
Danaus plexippus monarch 2025-10-03 view observation
Capnoides sempervirens rock harlequin 2025-10-05 view observation
Cornus rugosa round-leaved dogwood 2025-10-05 view observation

Buffer Zone Species

© Kyle Lima
Scientific Name Common Name Date Observed Link
Frangula alnus alder buckthorn 2025-10-05 view observation
Solanum dulcamara bittersweet nightshade 2025-10-02 view observation
Solanum dulcamara bittersweet nightshade 2025-10-04 view observation
Solanum dulcamara bittersweet nightshade 2025-10-04 view observation
Cirsium arvense creeping thistle 2025-10-05 view observation
Cirsium arvense creeping thistle 2025-10-05 view observation
Euphorbia cyparissias cypress spurge 2025-09-29 view observation
Berberis vulgaris european barberry 2025-10-04 view observation
Amorpha fruticosa false indigo bush 2025-10-02 view observation
Impatiens glandulifera himalayan balsam 2025-10-02 view observation
Impatiens glandulifera himalayan balsam 2025-10-02 view observation
Lupinus polyphyllus large-leaved lupine 2025-10-03 view observation
Lonicera morrowii morrow’s honeysuckle 2025-10-04 view observation
Rosa rugosa rugosa rose 2025-09-29 view observation
Rosa rugosa rugosa rose 2025-09-30 view observation
Rosa rugosa rugosa rose 2025-10-02 view observation
Rosa rugosa rugosa rose 2025-10-02 view observation
Rosa rugosa rugosa rose 2025-10-03 view observation

New Park Species

A something
© Kyle Lima

There were no new species to the park reported this week.

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